Prahv

If you cast a spell this turn, you can't attack with creatures. If you attacked with creatures this turn, you can't cast spells. Whenever chaos ensues, you gain life equal to the number of cards in your hand.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6ofwbgbe3ppb1hykbltiah.